The estimates for transient climate response range from near 2.52 F (1.4 C) offered by recent research, to the IPCC's estimate of 1.8 F (1.0 C). (citylab.com)
The inter-model correlation of transient climate response with ocean heat uptake efficacy is greater than its correlation with equilibrium climate sensitivity in an ensemble of climate models used for the 3rd and 4th IPCC assessments. (gfdl.noaa.gov)
Since the Southern Ocean is important for ocean heat uptake, this results in some uncertainty in transient climate response. (ipcc.ch)